Double kitchen timer

Abstract

This invention is a spring driven timer with primary and secondary time selection knobs rotating on a common center. The knobs are connected to a solid and a hollow concentric shaft, respectively, which in turn are connected to respective hammer mechanisms. When the primary knob is turned, a tab simultaneously turns the secondary knob to a desired longer time interval. Then the primary knob is set at a desired shorter time interval. When each knob (turned by a common clock mechanism) reaches the 0 time position, each respective hammer is impacted upon a single common bell. Two possible external embodiments of the device are presented.

We claim: 
     
       1. A spring-driven timer with the capability of selection of either one or two time intervals, which consists of: a. a case, upon which are placed numerals and indicia signifying intervals of time   b. a primary and a secondary knob on a common center which are rotated in conjunction manually by means of a tab, which is part of the primary knob   c. a solid shaft which extends from the primary knob to a hammer mechanism   d. a hollow shaft concentric to the solid shaft which extends from the secondary knob to a second hammer mechanism   e. two hammers which are cocked by their respective hammer mechanisms   f. a common clock mechanism which rotates both the primary and secondary knobs   g. a common bell which can be struck by either both hammers concurrently or by each hammer consecutively.   
     
     
       2. A spring-driven timer with the capability of selection of either one or two time intervals, which consists of: a. upper and middle cover members each capable of independent rotation with respect to a lower cover member, and upon which are placed numerals and indicia signifying intervals of time wherein each of said members has a 0 minute mark thereon   b. a primary tab at the 0 minute mark of the upper cover member and a secondary tab at the 0 minute mark of the middle cover member wherein these tabs allow the middle cover member to be rotated in conjunction with the upper cover member when the timer is initially set   c. an index mark which is part of the lower cover member and which extends behind the middle cover member to the surface between the upper and middle cover members wherein said index mark provides a reference mark against which the desired time intervals can be set and (b) provides a stop for the upper and middle cover members upon expiration of the desired time interval of intervals.   d. a solid shaft which extends from the upper cover member to a hammer mechanism   e. a hollow shaft concentric to the solid shaft which extends from the middle cover member to a second hammer mechanism   f. two hammers which are cocked by their respective hammer mechanisms   g. a common clock mechanism which rotates both the upper and middle cover members   (h) a common bell which can be struck be either both hammers concurrently or by each hammer consecutively.